WattCost

Data through July 2026

Running cost · Water Heaters (Electric) · ENERGY STAR certified

Rheem XE40T10H22U0

For a standard household draw pattern, the Rheem XE40T10H22U0 uses a certified 643 kWh per year: roughly $118 annually at the national average rate. That puts it in the most efficient tenth of every certified electric water heater — 42% less electricity than the median, ranked 4 of 605. Where you live moves the bill from $82 a year in Louisiana to $309 in Hawaii.

Dimensions 62.3" H × 20.3" W

Estimated annual running cost · U.S. average rate 18.3¢/kWh

$118/yr

$118 · cheapest certified water heaters (electric)$319 · priciest
Per month
$9.81
Per day
32¢
Certified use
643 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
240 Volt Integrated HPWH
Storage volume
36 gal
First-hour rating
46 gal
UEF
3.45
643 kWh1,741 kWh
Where the Rheem XE40T10H22U0 (▮) sits among all 605 certified water heaters (electric), by annual kWh

What it costs in every state

Rheem XE40T10H22U0: 643 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$105
Alaska28.8¢$185
Arizona15.4¢$99
Arkansas14.3¢$92
California33.6¢$216
Colorado17.0¢$109
Connecticut24.2¢$155
Delaware18.5¢$119
District of Columbia25.2¢$162
Florida15.0¢$97
Georgia16.3¢$105
Hawaiipriciest48.0¢$309
Idaho13.7¢$88
Illinois19.2¢$124
Indiana16.7¢$108
Iowa16.0¢$103
Kansas15.3¢$98
Kentucky13.8¢$89
Louisianacheapest12.7¢$82
Maine32.4¢$208
Maryland21.4¢$138
Massachusetts30.5¢$196
Michigan23.1¢$148
Minnesota17.4¢$112
Mississippi14.5¢$93
Missouri16.1¢$103
Montana15.0¢$96
Nebraska13.8¢$89
Nevada12.8¢$82
New Hampshire26.6¢$171
New Jersey25.2¢$162
New Mexico16.1¢$103
New York29.9¢$192
North Carolina15.2¢$97
North Dakota13.4¢$86
Ohio19.4¢$125
Oklahoma14.3¢$92
Oregon16.0¢$103
Pennsylvania21.7¢$140
Rhode Island28.3¢$182
South Carolina15.5¢$99
South Dakota15.4¢$99
Tennessee13.7¢$88
Texas15.9¢$102
Utah13.1¢$84
Vermont23.8¢$153
Virginia17.6¢$113
Washington14.7¢$95
West Virginia15.8¢$101
Wisconsin19.1¢$123
Wyoming14.4¢$92

Certified models closest in efficiency

electric water heaters within reach of 643 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich PROH40 T2 FD400-15643$118
Rheem PROPH40 T2 RH375-15643$118
Rheem PROPH40 T2 RH400-15643$118
Rheem XE40T10H22U1643$118
Richmond 10E40-HP5U15643$118
Ruud PROUH40 T2 RU375-15643$118

Run your own numbers

Your rate, your numbers

Per day
32¢
Per month
$9.81
Per year
$118

643 kWh/yr × 18.3¢/kWh = $118/yr

Prefilled with this model's certified 643 kWh/yr — adjust if your usage differs from the DOE test basis. The certified annual kWh comes from the DOE Uniform Energy Factor test, which simulates a typical household's daily hot-water draw pattern. Only electric models (including heat-pump units) are listed — gas models burn gas, not kWh.

Questions, answered with the data

How much electricity does the Rheem XE40T10H22U0 use?
ENERGY STAR certifies the Rheem XE40T10H22U0 at 643 kWh per year. The certified annual kWh comes from the DOE Uniform Energy Factor test, which simulates a typical household's daily hot-water draw pattern. Only electric models (including heat-pump units) are listed — gas models burn gas, not kWh.
How much does the Rheem XE40T10H22U0 cost to run per month?
About $9.81 a month at the U.S. average residential rate (18.3¢/kWh) — 32¢ a day, or $118 a year. Your state's rate moves this up or down; see the table above.
Is the Rheem XE40T10H22U0 energy efficient?
It uses 42% less electricity than the median certified electric water heater, placing it in the top 10% of certified models.
What does the Rheem XE40T10H22U0 cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $82 a year in Louisiana (12.7¢/kWh) and $309 in Hawaii (48.0¢/kWh).

Keep digging